Device for braking a train flyer on multiple twisting spindles



Sept. l0, 1968 w. HEIMEs ET AL DEVICE FOR BRAKING A TRAIN FLYER ONMULTIPLE TWISTING SPINDLES 2 Sheets-Shed l Filed May 15, 1967 IllIIIll/l/Mvfn/rafas -/e//ves Sept. l0, 1968 w, HEMES ETAL DEVICE FOR BRAKING ATRAIN FLYER ON MULTIPLE TWISTING SPNDLES Filed May l5, 1967 2Sheets-Sheet 2 FIG. 4

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United States Patent O DEVICE FOR BRAKING A TRAIN FLYER N MULTIPLETWISTING SPINDLES Willy Heimes, Krefeld, and Hans Grapp,Krefeld-Forstwald, Germany, assignors to Palitex Project-CompanyG.m.b.H., Krefeld, Germany Filed May 15, 1967, Ser. No. 638,340 Claimspriority, application Germany, May 17, 1966,

P 39.458; Apr. 22, 1967, P 41,969 11 Claims. (Cl. 57-53.3)

ABSTRACT OF THE DISCLGSURE The present invention relates to a device forbraking a train flyer -on multiple twisting spindles, which includes atrain flyer having a bearing hub freely rotatable about the axis of thespindle shank, while friction surface means are provided below the trainflyer for selective fristion braking engagement with said 'braking hu-b.The device furthermore comprises magnetic means respectively connectedto the `spindle shank and the ybearing hub and operable selectively tomove the bearing hub relatively toward and away from said frictionsurface means for selectively increasing and decreasing the frictionalengagement of said bearing hub with said friction surface means and alsofor selectively `frictionaily disengaging said hub from said frictionsurface means.

The present invention relates to a device for braking a train flyer ofmultiple twisting spindles for twisting with overhead unwinding of thethread from a feeding bobbin at a standstill or from a plurality offeeding bobbins arranged axially one above the other, the threadswithdrawn upwa-rdly being pulled axially through the hollow spindleshank in downward direction. In this connection, the hollow spindleitself may form the thread-guiding tube or may serve for receiving andholding a threadguiding tube. In the interior of the hollow spindleshank, the threads as a rule pass through a thread brake.

The said feeding bobbins are usually so-called crosswound bobbins withwhich the unwinding point of the threads from the main mantle surfacemoves continuously back and forth over the entire length of the bobbin.Since the unwinding force from the mantle surface of the bobbin at lanupper incline is directed inwardly, sometimes SO-called train flyers areemployed as auxiliary means which first cause the thread or threads tomove at an incline upwardly from the feeding bobbin so that the threadsfirst are deviated in upward direction inwardly in the thread-guidingeye at the free end yof the train flyer, and thereafter are deviateddownwardly into the hollow spindle shank.

By employing a train flyer with a thread-guiding eye at the free end, itis assured that the thread being withdrawn from the feeding bobbincannot contact the upperouter edge of the bobbin, whereby otherwise athread "break would be caused. Inasmuch as the unwinding point of thethread or the threads is in view of the crosswinding of the feeding'bobbin continuously displaced over the length of the bobbin, the freethread length between the unwinding points for the deviations `differsand varies continuously. As a result thereof, the train flyer which isdragged -by the thread rotates in a jerky and non-uniform manner and mayeven run ahead of the thread, so that loops form. l

Among others, a train flyer has :been suggested, the thread engagingedge of which over an angle of 180 approximately follows the shape of alogarithmic spiral and at the end has a self-threading thread-guidingeye. Such a train flyer brings about the advantage that the threadwithdrawn from the feeding bobbin when being threaded from above intothe hollow spindle shank or thread-guiding tube, does not have from thevery start to be inserted int-o the thread-guiding eye of the trainflyer. Such insertion is not necessary at all. When the spindle startsrotating, the thread will automatically engage the thread-engaging edgesof the train flyer, and while carrying along the train flyer, will movealong the thread-engaging edge until the thread engages thethread-guiding eye, and thus is kept at a distance from the upper edgeof the feeding bobbin so as not to Contact the latter.

In order with the above mentioned train flyers to assure a uniformrotation, the train flyer is subjected to a braking operation while thebearing hub of the train flyer engages an annular braking surface.However, the braking oper-ation will require different braking force,depending on the speed of the spindle and the type of threads beingprocessed. These -braking forces are, with heretofore known and with thesuggested multiple twisting spindles produced by the fact that thebea-ring hub of the train flyer is lplaced under a more or less highload, for instance, by mounting thereon rings as a weight so that thefriction at which the bearing hub, during its rotation, engages theybraking surface, will accordingly assume different values in conformitywith the magnitude of the mounted weights.

The variation in the braking force by means of weights make-s possible astepwise change in the conditions of friction. However, keeping theweights in preparedness and the selection of the necessary weightscaused difliculties. The heretofore known solutions for changing thefrictional conditions are, therefore, unsatisfactory.

'Starting with a train flyer, which in the form of a thread unwindingaid on multiple twisting spindles for the overhead withdrawal of threadsfrom crosswound bobbins, Iby means of its lbearing hub, freely rotatablysurrounds the hollow spindle 4shank and rests in a downward direction ona braking surface, it is an object of the present invention to provide adevice for braking the train flyer in which the braking force can :bechanged in steps or infinitely without the employment of additionalweights.

It is another object of this invention to provide a device as set forthin the preceding paragraph, which will be able to relieve entirely, ornearly entirely, the braking surface from the bearing hub of the brakingflyer so that i the conditions of circulation of the train flyer can becontrolled in wide limits.

These and other objects and advantages of the invention will appearmo-re clearly from the following specification in connection with theaccompanying drawings in which:

FIG. 1 illustrates a section through the upper end of a hollow spindleshank with inserted thread brake, and with a train flyer and a devicefor adjusting the braking force acting upon the train flyer.

FIG. 2 is a top view on the free end of the hollow spindle shank with atrain flyer according to FIG. l.

FIG. 3 is a side view of the annular magnet carrier according to FIG. l.

FIG. 4 illustrates, partially in section and partially in view, theupper end of a hollow spindle shank with train flyer hub and annularmagnet carrier of a different embodiment of the present invention.

FIG. 5 is a further embodiment of the present invention similar to thatof FIG. 4, according to which the train flyer hub extends over theannular magnet carrier.

FIG. 6 is a section through the upper end of a hollow spindle shank witha train flyer freely rotating about said spindle shank, while on thebearing sleeve for said train flyer there is provided a thread brake.

FIG. 7 is a partial development of the arresting or indexing means of anarresting or indexing device.

FIG. 8 is a section through the thread brtke taken along the lineVIII-VIII of FIG. 6.

The device for braking a train flyer, according to the presentinvention, is characterized primarily in that the bearing hub is adaptedyby magnetic force to he pressed against the braking surface and is alsoadapted to be lifted off said braking surface up to approximatelyfloating position.

Thus, in conformity with the present invention, the heretofore commonlyemployed weights for varying the braking forces have been replaced bymagnetic forces which become effective on the bearing hub and furnishthe necessary braking pressure or promote a complete, or nearly completerelief of the braking surface.

According to a further development of the present invention, the bearinghub may be provided with an annular magnetic body around which extends,with radial play, an annular magnet which is axially adjustably arrangedat the free end of the hollow spindle shank.

Due to the cooperation of the annular magnetic body on the bearing hubof the train flyer with the annular magnet which is axially displaceablyarranged at the free end of the hollow spindle shank, the pressing forceat which the bearing hub is engaging the braking surface can be variedby displacing the annular magnet with regard to the annular magneticbody. Thus, in conformity with the change in the magnetic eld, thebraking force can be increased or decreased, or the bearing hub on thebraking surface can be eliminated entirely, or nearly entirely, bymoving the bearing hub with the train flyer by magnetic force into afloating position.

More specifically, according to the present invention, the annularmagnet may be arranged on an annular magnet carrier which is axiallyadjustably mounted at the free end of the hollow spindle shank.

If thus the annular magnet carrier with the annular magnet is more orless moved away from the braking surface, this displacement causes thebearing hub of the train flyer to be lifted olf the braking surface to acertain extent, in other words, brings about at least some relief sothat the braking forces will be reduced or will be completely eliminatedwhen the bearing hub is lifted ofl completely so that the bearing hubwith the braking flyer will move into a floating position.

When the annular magnet carrier with the annular magnet is moved intothe opposite direction, the magnetic forces will, through theintervention of the annular magnet body, press the bearing hubcorrespondingly stronger against the braking surface so that the brakingsurface will be increased and the thread will have to furnish more Ipower in order to take the train flyer along during its rotation.

According to a still further development of the invention, the bearinghub may unilaterally be extended through a bearing sleeve having mountedthereon the annular magnetic body, whereby the conditions are createdwhich permit a different design for the bearing hub when employinguniform annular magnetic bodies, depending on how the bearing hub isplaced upon the upper end of the hollow spindle shank.

According to a further development of the invention, the annularmagnetic carrier may be arrestable at a number of different levels withregard to the hollow spindle shank. This may be effected by an arrestingdevice so that during the operation, an undue displacement will not bepossible. Moreover, there exists a possibility by means of an arrestingdevice in combination with markings, to pre-adjust a certain desiredbraking value or to bring about the desired relief of the brakingsurface.

Still according to another feature of the present invention, the annularmagnet carrier may be formed by a threaded bushing which extends aroundthe free end of the hollow spindle shank. The said threaded bushing has,at that side thereof which is adjacent to the train flyer, connectedthereto 4the said annular magnet. Also in this CII Cil

instance, the employment of an arresting device is possible in order tomaintain the annular magnet carrier at certain threaded bushings.

According 4to still another feature of the present invention, theannular magnet carrier may be designed as a sliding bushing whichsurrounds the free end of the hollow spindle shank. This sliding bushingis spring biased, the force of the spring being directed toward thetrain flyer hub. The said sliding bushing rests by means of at least oneradially directed pin on a step of an annular groove extending in stepsaround the hollow spindle shank. With this embodiment, the axialdisplacement and arresting of the annular magnet carrier is effectedsimilar to ballpoint pins with which by means of guiding grooves andnotches or the like, it is possible to move the end of the lead out ofthe pin against the thrust of a spring, and is also insertable by springforces. However, there exists the difference that with the arrangementaccording to the present invention, not two positions, but a multiple ofpositions may be provided for the annular magnet carrier, whichpositions have associated therewith different braking forces.

If with the device according to the invention, a train flyer isprovided, the thread-engaging edge of which follows approximately theshape of a logarithmic spiral and if such a device at the end thereof asa self-threading thread-guiding eye, it is possible according to thepresent invention, to design the annular magnet carrier in the form of abody which tapers in the manner of a paraboloid toward the free end of ahollow spindle shank, said last mentioned body having an annular magnetconnected thereto. In this instance, the annular magnet carrier actssimilar to the train flyer as an unwinding aid, namely, when the threadduring its course has not yet entered the thread-guiding eye. In thisinstance, the thread could engage the upper edge of the feeding bobbin,but this is prevented by the annular -magnet carrier with a farprotruding lower edge. The said annular magnet carrier, due to theparaboloid shape of its mantle surface, keeps the thread during thestarting movement thereof away from the upper edge of the deliverybobbin and gradually leads said thread `to the deviating point of thefree end of the hollow spindle shank into which the thread is pulled indownward direction.

If an annular magnet carrier is employed which has the shape of aparaboloid body, the annular magnet carrier may be designed as a hollowbody and may, through openings in the mantle surface, give oil wettingand reviving substances as disclosed in U.S. Patent 3,295,305.

In order to be able to pre-adjust the braking force depending on thetype of threads to be processed, it is possible according to the presentinvention to provide marks around the hollow spindle shank and on theannular magnet carrier, which indicate the level of the annular magnetswith regard to the hollow spindle shank. I f the annular magnet body is,for instance by means of an adjustable thread, screwed onto the hollowspindle shank so that its position as to height is variable by turningthe annular magnet carrier, the respective adjusted braking force may beindicated by markings at the upper edge of the annular magnet carrier,said markings having associated therewith a mark on the hollow spindleshank. Similar provisions may be made when the annular magnet carrier isdesigned as a sliding bushing which extends around the free end of thehollow spindle shank. In this instance, by markings on the annularmagnet carrier and on the hollow spindle shank, it can be indicated atwhich arresting step of the annular magnet carrier and at which brakingforce an adjustment has been made. Thus, there is furnished thepossibility of a pre-adjustment while at the same time, there is avoidedthe danger of an undesirable adjustment during the twisting operation.

According to the present invention, the device may also be so designedthat it will, at the same time, also influence the thread pull throughthe hollow spindle shank. To this end, the invention provides that athread brake is arranged on the bearing sleeve above the inlet end ofthe hollow spindle shank. This brings about that the device for brakingthe train yer simultaneously serves for braking the thread entering thehollow spindle shank, so that a special thread brake lwithin the hollowspindle shank is not necessary, which in itself is an importantsimplication in the servicing and assembling operation.

More specifically according to the present invention, a bearing supportmay be arranged on the bearing sleeve. In the said bearing support thereare journalled the bearing studs of two thread braking discs known perse, which are pressed against each other by variable force. The mantlesurfaces of said thread braking discs are tangent to the spindle shankso that the thread withdrawn from the feeding bobbin will, after passingthrough the threadguiding eye at the free end of the train yer, passthrough the'brake which simultaneously deviates the thread into thehollow spindle shank. In this connection, it is ,of particular advantagethat the bearing sleeve rotates with the train yer so that no rollingfriction occurs on the thread, as is the case with a hollow spindleshank the free upper inlet end is at a standstill.

Referring now to the drawing in detail, FIG. 1 shows in dot-dash linesthe feeding bobbin 1 with the yarn 2 wound thereupon. Within the feedingbobbin 1, there is shown the multisectional hollow spindle shank withthe portion 3 directly surrounded by the feeding bobbin 1. Within theinterior of said portion 3 there is located a thread brake of whichthere is shown the fixed brake ring 4 and the brake sleeve 7.

A truncated cone member 8 through which the threadguiding tube 9 extendsis inserted into the lower end of the portion 3 of the hollow spindleshank. The base of truncated cone 8 has connected thereto a brake disc10 on which the bearing hub 11 of the brake yer 12 rests. Bearing hub 11is, by means of bearing sleeve 13, extended in upward direction. Bearinghub 11 rests, by means of radially inwardly protruding cylindrical slidesurface 14, on the thread-guiding pipe 9 whereby a free and practicallyfrictional circulation of the hub 13 of the train iyer 12 about thethread-guiding tube 9 will be assured.

The pressing force and thus, the braking force, of the bearing hub 11 onbrake d-isc 10 may be varied by means of the annular magnetic body 15which is mounted on bearing sleeve 13, and -by means of the annularmagnet 6, which with radial play extends around the annular magneticbody 15, and to this end is connected in the carrier 17 for the annularmagnet. Said carrier 17 has approximately the shape of a paraboloidwhich tapers toward the free end of tbe hollow spindle shank.

In this instance, the carrier or support 17 in the form of a paraboloidserves as an additional unwinding aid, namely when the thread, duringthe starting phase, is not located in the thread-guiding eye 24 at thefree end of the train iiyer 12. The thread-guiding eye 24 is, in view ofthe curvature of the wire forming said threadguiding eye or in view ofthe type of the various angled portions, a self-threading eye into whichthe thread which rst engages the thread-contacting edge 25 of the trainflyer 12 will automatically pass after sliding along said edge 25.

In order to assure that the thread while circulating and carrying alongthe train yer 12 will gradually pass along edge 25 and move outwardly,the thread engaging edge' 25 has the s-hape of a logarithmic spiralwhich starts at the bearing hub 11.

For purposes of facilitating the thread circulation when the thread,during the starting phase of the spindle, passes along the mantlesurface of the annular magnetic carrier 17, the mantle is provided withthe spiral shaped groove 23.

The annular magnet carrier 17 in the form of a paraboloid may, inconformity with FIGS. 1 to 3, be designed as a hollow 'body which in theinterior thereof has a wetting means, or a iinishing preparation, whichthrough openings leading into grooves 23 passes outwardly and wets thethread during the rotation thereof. In this way, the thread is, prior toits twisting operation proper in the spindle, subjected to wetting or tothe treatment by a finishing operation.

As will be seen in FIG. 1, the annular magnet carrier 17 is, by means ofthe thread 18, screwed onto the extension 19 of the part 3 of the hollowspindle shank so that the location of the annular magnet 16, with regardto the hollow spindle shank, can be varied by turning the annularmagnetic carrier 17.

If, for instance, the annular magnetic carrier 17 is so rotated that itis being displaced toward the free end of the hollow spindle shank, theannular magnet 16 'brings about a corresponding displacement of thebearing hub 11, which will thus at a reduced pressure, press upon thebraking disc 10 or will even in a floating manner be lifted oft saiddisc 10.

By turning in the opposite direction, the annular magnet 16 will,through the intervention of the annular magnetic body 15, bring aboutthat the bearing hub 11 will be closer to the breaking ring 10 or willbe pressed thereagainst whereby the braking eiect impeding the rotationof the train yer 12 will be increased.

The adjustment of the annular magnet 16, by turning the annular magneticcarrier 17, can be effected in a very tine manner, especially if thethread 18 is designed as a -ne thread.

According to FIG. l, provision is made to the effect that the annularmagnetic carrier 17, after a certain angle of rotation, is held by anarresting device with which a further turning requires the overcoming ofthe thrust of a spring. To this end, all the way around the extensionmember 19 of part 3 of the hollow spindle shank, there are -distributedlongitudinal grooves 20 adapted to be engaged by a ball 21, which iscontinuously biased by a spring 22. It would thus be assured that theannular magnetic carrier 17 will not actually be displaced and thatinstead, a turning, i.e. an axial displacement, requires thedisplacement of the ball 21 out of a groove 20. Thus, the oatingcondition or various braking positions can be pre-set, to which end, asindicated in FIG. 2, the upper end or marginal portion of the annularmagnet carrier 10 is provided with markings a, b, c, for cooperationwith the marking d on the extension member 19 of the part 3 of thehollow spindle shank.

FIG. 4, partially in section and partially in view, illustrates amo-died arrangement of a device, according to the invention, forbreaking the train flyer. Similar to the preceding embodiment, thetruncated cone 8 mounted on the thread-guiding tube 9 has mounted on itsbase surface the brake disc 10a, labove which there is loca-ted thebearing hu-b 11 with the train flyer 12. The annular magnetic body 15 ismounted on the bearing sleeve 13 which similar to the construction ofthe above described embodiment, by means of two rounded bearing surfaces14, extends around the thread-guiding tube 9 with bearing play. Theannular magnet 16 extends co-axially and with radial play about theannular magnetic body 15. The magnet 16 is surrounded by the annularmagnet carrier 26 designed as a sliding sleeve. The magnet carrier 26extends displaceably with slide iit around the inner portion of abearing cap 27 mounted on the free end of the thread-guiding tube 9. Cap27 has a U-shaped cross section with the legs of the U extendingdownwardly. The inner leg 28 rests on the thread-guiding pipe 9, whereasthe outer leg 29 with radial play extends around the magnet carrier 26designed as sliding bushing.

The magnet carrier 26 is provided with the radially inwardly protrudingarresting pin 30. There also exists the possibility of providing aplurality of pins 30 uniformly distributed all the way around. The freeend 31 or the arresting pin 39 extends into a groove 34 in the leg 28 ofcap 27. The groove 34 extends all the way around in steps 33, so that aplurality of steps 33 distributed over the circumference is available onwhich the pin 30 can rest by means of its end 31. In this way, themagnetic ring carrier 26 may be set for various heights or levels. Themagnet ring carrier 26 is held on the various steps 33 by means of aspring 32. On the other hand, the carrier 26 rests on cap 27 on the baselegs thereof.

With this embodiment, markings may Ibe provided, on one hand, on `thesaid carrier 26 and on the other hand, on leg 29 of cap 27. Thesemarkings are associated with the various steps 33 of groove 34 in leg 28of cap 27.

According to the position of the carrier 26 in FIG. 4, said carrier,through the intervention of annular magnets 15, has lifted the bearinghub 13 with train ilyer 12 olf the braking disc 10, so that the latteris held in a floating condition. The bearing hub 13 will thus be brakedexclusively by the friction of rotation of the bearing surface 14 ofbearing hub 13 on thread-guiding tube 9.

When the annular magnet carrier 26 is displaced downwardly, the bearinghub 11 is pressed against the braking disc 1G at greater or lowerpressure, the maximum braking force occurring when the magnetic ringcarrier 26 moves into position (shown in dash lines).

The embodiment of FIG. 5 corresponds to that of FIG. 4, with thedifference that the bearing hub 11 is provided with a sleeve, the crosssectional shape of which corresponds to the cap 27 of FIG. 4. The innerleg is formed by the bearing sleeve 13 with the bearing surfaces 14, bymeans of which the hub 13 extends around the thread-guiding tube 9. Thebearing hub 11 thus extends around the outermost free end of thethread-guiding pipe 9.

The bearing sleeve 13 forming a part of the bearing hub 11 may have itsbraking surface 35 be brought into engagement with braking disc bydisplacing the annular magnet carrier 26 downwardly, which latter is inthe form of a sliding sleeve. Carrier 26, by means of its annular magnet16, extends around the bearing sleeve 13 and the magnetic ring thereof,and also extends around the cylindrical section 36 of truncated cone 8with slide fit. In the cylindrical section 36 of the truncated cone S,there is provided, in conformity with FIG. 4, a step-shaped annulargroove 34. The free end 31 of the arresting pin can rest on any of thesteps 33. Pin 30 is connected to the magnetic ring carrier 26 and bymeans of its free ends 31, engages the groove 34. Also, with thisembodiment, a spring 32 axially engages the annular magnet carrier 26,said spring having its outer end resting on the truncated cone 8.

An upward displacement of the carrier 26 brings about relief of thebraking disc 10 and thus leads to a lifting off of the bearing hub 13from the braking disc 10. Correspondingly, a downward displacement ofthe carrier 26 magnetically brings about a more or less strongengagement of the braking surface of bearing sleeve 13 with braking disc10.

In conformity with FIG. 4, also with the embodiment of FIG. 5 it ispossible by markings on the carrier 26 and truncated cone 8, to effect apre-setting -of the braking force or a certain floating position of thebearing hub 11 with the train flyer 12.

Similar to the preceding embodiments, it is also possible to effect thebraking of the train flyer 12, which does not have to be of the designshown in FIG. 2, within wide limits, while there also exists thepossibility of limiting the braking to the slide friction of the bearinghub 13 on the thread-guiding hub 9.

The device for braking the train llyer 12, according to FIGS. 6 to 8, isdesigned in a manner similar to that in FIG. 5. A portion of the hollowspindle shank is formed by the insert member, which has its lower enddesigned in the form of a truncated cone 8 and through which extends thethread-guiding tube 9. Connected to the upper end face of the insertmember 8 is the braking'disc 10 on which the bearing hub 11 of thebraking illyer 12 rests. Above the braking tlyer plane, the bearing hubis designed as a doubleewalled bearing sleeve 13', the inner wall on theoutside thereof supporting the annular magnet body 15. The bearingsleeve rests on the thread-guiding tube 9 b; means of the radiallyinwardly protruding annular sliding surface 14 whereby a free and almostfrictionless rotation ofthe bearing sleeve 13 of train flyer 12 aroundthe threadguiding tube 9 will be assured.

For purposes of changing the pressing force and there by the brakingforce of the bearing hub 11 onV the braking disc 10, the bearing hub 11may have its braking surface 35 brought into engagement withthef'braking disc 10 by downwardly moving the sliding sleeve 26, whichhas its inner side provided with the annular magnets 16.

During this downward displacement, the annular magnets 16 pull themagnet body 15 -and thus, the bearing hub 11, or bearing sleeve 13,downwardly and press the latter-against the braking disc 10. f

yThe sliding sleeve 26 extends, With play, around not only the innerwall of the bearing sleeve 13 but simultaneously with radial play, alsoaround the upper free end of the insert body 8 of the hollow spindleshank. The cylindrical section 36 of the insert body 8 has a step 37against which the spring 32 rests, which has its other end resting onthe step 38 of the sliding sleeve 26. Spring 32 urges the sliding sleeve36 with the magnet ring 15 to move in upward direction. The position ofthe `sliding sleeve or the location of thrust of spring 32 can be fixedby means of the arresting pin 30 in the sliding sleeve 26. Pin 3@extends radially inwardly into one or yanother arresting slot 39 of thearresting sleeve 40, which is mounted on the upper end of thecylindrical section 36 of the insert body 8. Depending on the yslot 39which is engaged by pin 30, which is made possible by turning thesliding sleeve 26, the magnet ring 15 will thus be located more or lessclose to the magnet 16 in the bearing sleeve 13 so that braking forcescan be realized which vary'by steps, and with which the bearing hub 11of the train yer 12 engages the braking disc 10.

The lu'gher the sliding sleeve 26 is located, the less will be thebraking force which in the highest position even leads to a lloatingposition of the train flyer hub 11,` so that the train flyer will beable to move practically free from friction when disregarding thefriction of rotation on the thread-guiding tube 9.

The bearing hub 11 extends unilaterally upwardly and forms a bearingsupport for the bearing studs 41, according to FIGS. 6 and 8, t-wobraking discs 42 and 43 being mounted on the bearingstud 41. The brakingdisc 42 is xed on bearing stud 41 as to its position, whereas the secondbraking disc 43 is axially displaceable, and by the thrust of spring 42is pressed against the braking disc 42. Spring 44 rests by means of itsother end on the bearing bushing 45, which receives the bearing stud41The bearing bushing 45 can [be axially displaced, in View of the factthat its pin 46 engages the arresting slots 47 of the bearing support,so that by pressing pin 46 into one of the arresting slots 47, thebearing bushing 45 is displaced more or less along the bearing stud 41within the bearing support whereby the adjustment of the force of thespring 44 will be made possible. The other end of the bearing stud 41 isfixed as to the other side of the bearing support.

Similar to the manner in which the train flyer 12 is rotated by thethread during its withdrawal from the delivery bobbin, also the bearingblock mounted on the bearing hub or bearing sleeve will rotate togetherwith the braking discs 42 and `43 so that the thread solely between thediscs 42 and 43 about the bearing stud 41 is deviated downwardly and ispractically not exposed to any friction. This applies vin part when alsothe bearing stud 41 is freely rotatable, which meansisfreelyvrotatablyjournalledin the bearing supports -at its end 48.

By means of the device illustrated in the drawing, according to FIGS. 6to 8, it is assured that also without any dissembly of the hollowspindle shank, merely by steps at the free end of said hollow spindleshank, not only the braking effect on the train fiyer can be changed,but also the braking of the thread when the latter passes through thehollow spindle shank, so that thread brake within the hollow spindleshank will be superuous.

It is, of course, to be understood that the present invention is, by nomeans, limited to the particular constructions shown in the drawings,but also comprises any modifications within the scope of the appendedclaims.

What we claim is:

1. 'In combination with a hollow spindle shank of a multiple twistspindle including a thread-guiding tube: a -train flyer having a bearinghub freely rotatable about said thread-guiding tube, means having afriction surface extending around said thread-guiding tube and arrangedbelow said train flyer for selective frictional braking engagement withsaid bearing hub, an-d magnetic means respectively connected to saidspindle shank and said bearing hub and operable selectively to move saidbearing hub relatively toward and away from said friction surface forselectively increasing and decreasing the frictional engagement of saidbearing hub with said friction surface and also for selectivelyfrictionally disengaging said hub from said friction surface.

2. A device according to claim 1, in which said magnetic means includesfirst annular magnet means mounted on said bearing hub and also includessecond annular magnet means extending with play around said first magnetmeans and being axially adjustably arranged on said spindle shank.

3. A device according to claim 2, which includes a support coaxiallyarranged on one end portion of said spindle shank and carrying saidsecond annular magnet means, said support being adjustable in the axialdirection of said spindle shank.

4. A device according to claim 2, in which said bearing hub has an axialextension in the form of a sleeve extending around said thread-guidingtube and supporting said first magnet means.

5. A device according to claim 3, which includes arresting meansassociated with said support for selectively holding the latter at anyone of a plurality of levels.

6. A device according to claim 3, in which said support is formed by athreaded sleeve threadedly engaging one end portion of said spindleshank, that end portion of said threaded sleeve which is adjacent saidflyer carrying said second annular magnet means.

7. A device according to claim 3, in which said support is formed by asliding bushing coaxial with said spindle shank, said spindle shankwithin the range of said sliding bushing being provided with peripheralgroove means extending around said spindle shank and having a pluralityof resting steps, spring means continuously urging said sliding bushinginto the direction toward said bearing hub, and pin means supported byand slidably mounted in said sliding bushing in a direction transverseto the axial direction of said sliding bushing, said pin means beingoperable selectively to be Irested on said steps.

3. A -device according to claim 3, in which said train flyer has athread-engaging edge following approximately the contour of aloga-rithmic spiral .with a self-threading thread-guiding eye at theoutermost end portion of said spiral, and in which said support has anouter contour approximately following the contour of a paraboloid, saidsecond annular magnet means being arranged at that end portion of saidsupport which is adjacent said train flyer.

9. A device according to claim 3, in which said support and said spindleshank are provided with markings for indicating the relative adjustmentof said support and thereby said second annular magnet means with regardto said spindle shank and thereby also the level of said second annularmagnet means with regard to said spindle shank.

10. A device according to claim 1, in which said bearing hub has anupwardly directed extension extending beyond the upper end of saidthread-guiding tube, and thread-'braking means supported by the upperend of said extension for braking a thread entering said thread-guidingtube.

11. A device according to claim 1), in which said threadbraking meanscomprises a bearing stud supported by said extension and twothread-braking discs supported by said bearing stud and means forpressing said discs against each other at variable pressure, the mantlesurface of said bearing stud being tangential to the longitudinal axisof said thread-guiding tube.

References Cited UNlTED STATES PATENTS 2,871,648 2/1959 Vibber 57-58.83XR 3,165,882 l/l965 Kreuschmer 57'58.83 3,347,035 10/1967 Ellison et al.5758.83 XR FOREIGN PATENTS 1,327,482 4/1963 France.

92,114 9/1959 Holland.

OTHER REFERENCES Volkman & Co.: German, Das 1,091,466, Oct. 20, 1960 57/5 8.83.

FRANK I. COHEN, Primary Examiner. W. H. SCHROEDER, Assistant Examiner.

